Merge pull request #6594 from piwik/translationupdates

[automatic translation update] Updated 427 strings in 24 languages (fi, nl, be, ca, id, ko, lv, pt, sq, vi, ja, da, de, el, fr, it, bg, cs, es, ro, ru, sr, sv, sl)
Add some debug logging to PluginsArchiver.
Allow UI tests to delete archiving tables.
Do not display nb_users series in row evolution is no data for the metric.
Add note about CliMulti URL encoding to method docs.
Add comment to screenshot testing for when no tests can be found telling user about --plugin parameter.